Self-locking nut.



LLLLLLLLLLLLL T.

APPUCATI .1912. 1,201,323. Patented 0@1;17,1916.

- :EUGENE rig. or'cmcaedinnmbxs. AssIeNonfrro x. Nun'v co.; or baremo,

azoteas 4ST PATENT OFFICE.

' A CORPORATION' 0F ILLINOIS.

Tof Vt imag/ concern .Be it lmqwn that 1, EUGENE-Elfman., citizen =of the United States, 'and a resident of Chicago, Cook county,`Illinis`, have m-Z vented certain new and useful Improvements in Self-Locking following is a specification.

"Thegeneral b]ect of my invention standard' commercial nuts'and which' s hall be capable of rbeing locked in position uponf a .bolt by screwing it tightly' against 'a load surface.

. Another object of myinventionis provide a self locking nut which can be applied by. unskilled mechanics with an ordinary wrench and vwhich can be repeatedly-used upon, a' bolt without, destroying either. the nut. or the bolt'.v

Further objects yof .my pear hereinafter.

piece lock nut of unique form, construction,

and arrangement whereby the objects named above, and others are attainable.

l `My invention' w1ll be more readilyunderl stood by reference to the@ accompanymg drawingsl lwhich illustrate: the preferred forms of my invention and in whi Figure 1 is a perspective view of a nut lembodying my invention; Fig. 2 is a cross..

sectional view through my nut in process of l ing the nut locked in manufacture; Fig. 3 is a cross sectional 'view' similar to Fig. 2 but showing the completely. formed nut; Fig. 4 isa sectional showe. .place'upon' `a bolt and' .against a, load surface.

Referring now to the drawings,

. -describe in detail my nut which embodies practical lock nut.

' ing from a bar of metal apiece of metal of nut size and either simultaneously or subsey quentlyl'forming a bolt hole 2 therein.. lIn

this operation 'a crown 3' is formed on' one end of the nut and this I prefer to retainl as the non-load end ofthe nut. In the opposite end of the nut I form a locking portion.

l Specification of Letters Patent. Patented oci-117; ll. application. @im oezgber 10,1912; serial No. 72am; t

formed' between the locli into the nut in manner to form the locking portion into asinglewing 6 which is con.-

nected -to the body'of the nut along" the line adjacent to the outerpart of the bolt hole. I have indicated'in Fi ,'2 by dotted lines 'the preferred position o the cut. After the formation'of the wing 6 I thread the bolt hole. In this manner. the body of the nut is' provided with a plurality of threads and: v the locking portion 4 which is preferably quitethin, is provided with alessl number of threads. The threads on thelocking por- 'tion are thereby mounted as on a4v lever and "sincethel-wing 6 -is .set up'with removal ofbut little metal'it can 4be restored to pre-V v formed position without danger ofbreak invention will np? age. Restoring the wing 6 moves the threads thereof out of alinement with the threads of the, body'portion. This is the action of the Anut when it is screwed upon a bolt 7 as indicatedin Fig. 4. The bolt as tapped is. ...usually made of such size that it can be readily started on the bolt Aand screwed to .the position in which the wing contacts the load surface 8. Further advancement of the nut requires considerable effort sincerit is accomplished only by the depression ofthe wing 6. This depression of the wingfmove's the Athreads carried thereby into forceful jfrictional engagement with the contiguousy bolt threads. When the nut reaches the position indicated in Fig. `4, that is, when the' WDLhaS `been entirely reset it acts' to prevent vany' 1'1ndesired.rotation of the nut upon tl1`e bolt.=""l`he nut, however, may .be forcibly removed 'by `means of a wrench and while vthe necessary and desirable yfeatures of a] f "bolt threads it does not distort' them to such My nut may be made by any of the well" known nut making processes, such as severthe locking' wing'may-slightly distort the adegree that the nut andlbolt cannot again be` used. I

In certain classes of work the excessive vibration and other actions' cause the load surface torecede. If the metal-cof my nut is ofsuch texture that ithas a considerable ,spring,'the" win 6 .will move out with the load surfacean thereby release its locking hold. Hence for this class of work I prefer 'to make the nut 'metal ofsuch composition tive of continued engagement with the load surface. Therefore the nut will be held in locked position upon the bolt even though the load surface should recede.

rlhe form of my invention, as shown and described admirably accomplish the objects.

outlined in the opening ot the specication, but since the relative size of the locking portion andthe body portion, and the precise form of the nut can be somewhat modiied without sacricing the substantial advantages of the nut disclosed, l do not wish to limit myself strictly to them except as required by the scope of the appended claims.

Having thus described my invention, l claim as new and desire to secure by' Letters Patent:

1. A one-piece lock nut provided with a bolt hole and comprising a bodyportion and -a relatively slnall locking portion, said locking portion consisting of asingle lever-like wing spaced from the body of the nut by a substantially wedge-shaped recess of substantially knife edge Width at the juncture of the wing and body portion, said leverlike rwing being separated from the nut body along a line parallel to the nut side and adjacent the periphery of the bolt hole,

the nut upon the bolt.

2. A self locking nut. of substantially the of the nut and in the locking portion, said locking portion beingA depressible to. prev formed position for the proportionsl of standard commercial nuts comprising a body' portion and a relatively thin locking portion integral therewith, said locking portion consisting of a singlewinglike member set up from the body of the nut and flaring gradually from its line of juncture with the nuty body adjacent the periphery of the bolt hole, said locking. portion beingI substantially tangential to the body portion at its juncture therewith and being formed substantially without removal of metal, screw threads in both the loclng portion and the body portionimade after the locking portion is set up, as and for the purpose specified.

ln testimony whereof, l have hereunto set my hand this 5th day of'0ctober'1912 in the presence of two subscribing witnesses EUGENE E. ER.v

Witnesses:

purpose of locking y 

